The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 2006
Filed:
Dec. 17, 2003
Thomas Granacher, Schaan, LI;
Franz Büchel, Ruggell, LI;
Ulrich Schiestl, Feldkirch, AT;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
The invention relates to a combustion driven working tool having a combustion chamber (), a piston () guided in a cylinder (), an ignition system for igniting a fuel supplied to the combustion chamber () for driving the piston () and a fan () at least for ventilating the combustion chamber (). The running time and/or the speed of the fan () can be set as a factor of a measured temperature to realize a combustion driven working tool where an optimal ignition behavior can be set under changing working conditions, in particular under conditions of changing external temperature. A combustion chamber temperature is measured by a first temperature sensor () arranged on the combustion chamber () and supplied to a control unit (), which calculates the cooling time and/or the speed for the fan () as a factor of the measured combustion chamber temperature and supplies these values to the motor (). A second temperature sensor () is utilized for measuring the external temperature for the calculation of the cooling time or the speed of the fan ().